How to lay a soaker hose so it waters the roots

October 8, 2025

The cheapest watering upgrade there is

A soaker hose is a length of porous hose that weeps water along its whole length instead of spraying it, and for a garden bed it'll beat a sprinkler on almost every measure, because the water goes into the soil at the roots rather than onto the leaves and into the air.

It also has no moving parts and no emitters to block, so it suits people who want the watering handled rather than a new hobby to maintain.

The catch is that a soaker hose laid badly is worse than a hose in your hand, because at least with a hose you can see where the water is going. So here's where the line goes.

Lay it along the plants, not around the bed

The commonest mistake is running it around the outside of a bed like an edge, which waters the perimeter and leaves the middle dry. A soaker hose wets a band of soil either side of itself, so the line has to sit where the roots are, which means running it down the rows and weaving it between the plants.

Keep the line within about 10cm of the stems for annual veggies. For something established with a wider root zone, run it out under the canopy rather than tight against the trunk, because that's where the feeder roots actually are.

How far apart the runs go, and it depends on your soil

Water spreads sideways through soil as well as downwards, and how far sideways is a soil question.

Sandy soil drains straight down and spreads very little, so runs need to be closer together, around 30cm apart.
Loam spreads reasonably, so 40cm to 45cm between runs is usually about right.
Clay spreads a long way sideways and accepts water slowly, so runs can go 50cm or more apart, and they've got to run longer and gentler.

You don't have to guess. Run the line for half an hour, then dig a small hole beside it with a trowel and look at how wide the wet band actually is. That one hole tells you more than any chart.

Under the mulch, every time

A soaker hose goes on the soil surface and the mulch goes on top of it. On top of the mulch it wets the mulch and a good part of that evaporates before it ever reaches soil, which throws away the main thing you've bought it for.

Under the mulch it stays cool and lasts a lot longer out of the sun, and the mulch holds the moisture in place while it soaks down. It also means you can't see the line, so put a couple of stakes in at the ends before you cover it or you'll find it with a fork next winter.

Pressure and length, and the bit that catches people

A soaker hose wants low pressure. Open the tap a quarter turn, not all the way. Full mains pressure makes the near end squirt and the far end do nothing, and over time it splits the hose.

Keep any single run under about 30 metres. Past that the far end simply doesn't get enough to weep properly, and the fix is to split it into two shorter runs off a two way connector rather than one long one.

And put a tap timer on it. The whole advantage of slow watering is that it needs time, which means it's very easy to forget and leave on all afternoon. A basic mechanical timer that winds down and shuts off doesn't cost much, and it takes the decision away from you entirely.

How long to run it

Longer and less often than you think, because the point of the whole exercise is to get water deep enough that roots follow it down instead of sitting near the surface waiting for you.

Start at 30 to 45 minutes, then dig beside a plant and see how far down the wet front got. You want it damp at about 20cm for veggies. If it's dry at that depth, run it longer next time rather than more often, and once you know the number for your soil you can set the timer and stop thinking about it.

Shop related products

Pope Simple Set Tap Timer. So a slow water doesn't become an all afternoon water.
Martins Organic Sugar Cane Bale 11kg. The mulch layer that goes over the top of the line.
Easy Wetta Garden Mulch 50L. A bagged alternative if a bale is more than you need.
Pope 12mm Three Way Hose Coupler. For splitting one tap across two shorter runs.

Did you know we keep soaker hose in the shop in a few lengths, along with drippers, micro sprinklers, hose fittings and garden stakes, and most of it never makes it onto the website. Give us a ring on (08) 8536 4333 to check what's on the shelf, or have a look through the garden centre range while you're at it.